view hgext3rd/topic/destination.py @ 3248:07c9b6f445bf

stablerange: rework the debug command to allow for multiple method

Similar to what we did for the other debug command related to sorting, we
prepare for the arrival of multiple method to produce the result (including
simple implementation that are easy to read but do not scale).

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial import (
    bookmarks,
    destutil,
    error,
    extensions,
)
from . import topicmap
from .evolvebits import builddependencies

def _destmergebranch(orig, repo, action='merge', sourceset=None,
                     onheadcheck=True, destspace=None):
    # XXX: take destspace into account
    if sourceset is None:
        p1 = repo['.']
    else:
        # XXX: using only the max here is flacky. That code should eventually
        # be updated to take care of the whole sourceset.
        p1 = repo[max(sourceset)]
    top = p1.topic()
    if top:
        revs = repo.revs('topic(%s) - obsolete()', top)
        deps, rdeps = builddependencies(repo, revs)
        heads = [r for r in revs if not rdeps[r]]
        if onheadcheck and p1.rev() not in heads:
            raise error.Abort(_("not at topic head, update or explicit"))

        # prune heads above the source
        otherheads = set(heads)
        pool = set([p1.rev()])
        while pool:
            current = pool.pop()
            otherheads.discard(current)
            pool.update(rdeps[current])
        if not otherheads:
            # nothing to do at the topic level
            bhead = ngtip(repo, p1.branch(), all=True)
            if not bhead:
                raise error.NoMergeDestAbort(_("nothing to merge"))
            elif 1 == len(bhead):
                return bhead[0]
            else:
                msg = _("branch '%s' has %d heads "
                        "- please merge with an explicit rev")
                hint = _("run 'hg heads .' to see heads")
                raise error.ManyMergeDestAbort(msg % (p1.branch(), len(bhead)),
                                               hint=hint)
        elif len(otherheads) == 1:
            return otherheads.pop()
        else:
            msg = _("topic '%s' has %d heads "
                    "- please merge with an explicit rev") % (top, len(heads))
            raise error.ManyMergeDestAbort(msg)
    return orig(repo, action, sourceset, onheadcheck, destspace=destspace)

def _destupdatetopic(repo, clean, check=None):
    """decide on an update destination from current topic"""
    movemark = node = None
    topic = repo.currenttopic
    revs = repo.revs('.::topic("%s")' % topic)
    if not revs:
        return None, None, None
    node = revs.last()
    if bookmarks.isactivewdirparent(repo):
        movemark = repo['.'].node()
    return node, movemark, None

def desthistedit(orig, ui, repo):
    if not (ui.config('histedit', 'defaultrev', None) is None
            and repo.currenttopic):
        return orig(ui, repo)
    revs = repo.revs('::. and stack()')
    if revs:
        return revs.min()
    return None

def ngtip(repo, branch, all=False):
    """tip new generation"""
    ## search for untopiced heads of branch
    # could be heads((::branch(x) - topic()))
    # but that is expensive
    #
    # we should write plain code instead

    tmap = topicmap.gettopicrepo(repo).branchmap()
    if branch not in tmap:
        return []
    elif all:
        return tmap.branchheads(branch)
    else:
        return [tmap.branchtip(branch)]

def modsetup(ui):
    """run a uisetup time to install all destinations wrapping"""
    extensions.wrapfunction(destutil, '_destmergebranch', _destmergebranch)
    bridx = destutil.destupdatesteps.index('branch')
    destutil.destupdatesteps.insert(bridx, 'topic')
    destutil.destupdatestepmap['topic'] = _destupdatetopic
    extensions.wrapfunction(destutil, 'desthistedit', desthistedit)